Abstract : Measurements of radio frequency signal radiation were made on personal telemetry transmitters within the frequency band of 6 to 280 MHz; first, in free space, and then with the unit on a subject. With the transmitter inductor used as a radiator, horizontally polarized signal radiation patterns were plotted at discrete frequencies throughout the band. The results, obtained by comparing free-space signal patterns with unit-on-subject signal patterns, indicate that the human body has little effect on the radiated signal pattern from 6 to 10 MGz; it operates like an antenna director element from 16 to 60 MHz; it produces a radiated pattern with bidirectional characteristics from 67 to 90 MHz; and it behaves like an antenna reflector from 103 to 230 MHz. Above 230 to 280 MHz, the body seems to have little or no effect on the radiated signal. (Author)